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Finding the Fourth Proportional to 18,911.92, 28,358.16 and 8,518

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Solution

The fourth proportional to 18,911.92, 28,358.16 and 8,518 is: 12,772.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.92 : 28,358.16 = 8,518 : x
  2. Step 2: Convert to fraction form
    18,911.92/28,358.16 = 8,518/x
  3. Step 3: Cross multiply
    18,911.92x = 28,358.16 × 8,518
  4. Step 4: Simplify right side
    18,911.92x = 241,554,806.88
  5. Step 5: Solve for x
    x = 241,554,806.88/18,911.92
  6. Step 6: Final answer
    x = 12,772.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.